Punnett Square and Pedigree Review 2

Front

How many alleles (letters) do each person carry for a trait?

Back

Each person carries 2 alleles for a trait.

Front

What is the correct genotype for individual I-2 in Huntington's Disease, a dominant trait?

Back

The correct genotype is hh.

Front

In a Punnett square, if T = tall and t = short, what belongs in the missing square if the other squares are filled with Tt, Tt, and tt?

Back

The missing square is tt.

Front

If a pedigree shows an autosomal recessive disorder, what MUST the genotype of individual II-3 be?

Back

The genotype must be hh.

Front

What is the genotype of two black mice (B = black, b = brown) that have some black and some brown offspring?

Back

The genotype of the parents is Bb x Bb.

Front

Define a Punnett Square.

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that will express itself in the phenotype even if only one allele is present.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable traits.

Front

What is an autosomal recessive disorder?

Back

An autosomal recessive disorder is a genetic condition that occurs when an individual inherits two recessive alleles for a trait.

Front

What is the significance of the letter 'H' in genetics?

Back

The letter 'H' often represents a dominant allele in genetic notation.